As a concertina newbie, one of my challenges is understanding the range of timbres that different concertinas make and how to talk about the differences. This makes it harder to understand if I've even heard concertina timbres at the ends of the spectrums. This leaves me with two questions:   1. What language or taxonomy do you find useful to describe concertina timbres? For example, Walker concertinas has a "mellow" to "bright" scale: https://www.wakker-concertinas.com/anglo overview.